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Title:
FORMATION OF COATING FILM ON SURFACE OF POWDER
Document Type and Number:
Japanese Patent JPH10237502
Kind Code:
A
Abstract:

To efficiently regulate film thickness with high precision and to form coating film having uniform thickness by regulating the compsn. of the raw material, the solid phase precipitating rate, the amt. of a substrate or the like in the conditions for forming coating film in which solid phase components such as metallic oxide or the like are precipitated and formed on the surface of a substrata of powdery grains in a soln.

The precipitating rate of solid phase components dissolved in a soln. is set to the conditions in which the solid phase components are supersaturated and the solid phases are not precipitated to places other than the surface of the substrate. Furthermore, the linear growing rate of the coating film on the surface of the substrata is set to less than the harmonic growing rate. Moreover, the setting of the precipitating rate of the solid components is executed by the setting of the concn. of the solid phase components in the soln., the volume of the solid phase components in the soln. to be precipitated, the surface area of the substrate, the volume of the substrate in the soln., the atmosphere of the soln., the time for precipitating the solid phase components or the condition of a catalyst for precipitating the solid phase components in the soln., where the volume of the solid phase components in the soln. to be precipitated is regulated to ≤30vol% to the volume of the liq. and the volume of the substrate in the soln. is regulated to ≤30vol% to the volume of the liq.


Inventors:
SHINKO TAKASHI
NAKATSUKA KATSUTO
Application Number:
JP3647697A
Publication Date:
September 08, 1998
Filing Date:
February 20, 1997
Export Citation:
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Assignee:
NITTETSU MINING CO LTD
NAKATSUKA KATSUTO
International Classes:
G03G9/083; B01J13/04; B22F1/02; C09C3/06; C09C3/10; G03G9/09; (IPC1-7): B22F1/02; B01J13/04; C09C3/06; G03G9/083; G03G9/09
Attorney, Agent or Firm:
Tadashi Hagino (3 outside)